Light-emitting device having control connection between gate of drive transistor and power supply, photoelectric conversion device, electronic apparatus, lighting device and moving body

Abstract

A light-emitting device includes a plurality of light-emitting elements and a plurality of pixel circuits. The plurality of pixel circuits each includes a drive transistor configured to drive a corresponding one of the plurality of light-emitting elements, a write transistor configured to write a signal to a gate of the drive transistor, and a light emission control transistor configured to control connection between the gate of the drive transistor and a power supply. The light-emitting device includes a first control line for controlling the write transistor, a second control line for controlling the light emission control transistor, a first circuit configured to incline a signal waveform of the first control line, and a second circuit configured to incline a signal waveform of the second control line.

What is claimed is: 
     
         1 . A light-emitting device including a plurality of light-emitting elements and a plurality of pixel circuits, the plurality of pixel circuits each including:
 a drive transistor configured to drive a corresponding one of the plurality of light-emitting elements;   a write transistor configured to write a signal to a gate of the drive transistor; and   a light emission control transistor configured to control connection between the gate of the drive transistor and a power supply,   the light-emitting device comprising:   a first control line for controlling the write transistor;   a second control line for controlling the light emission control transistor;   a first circuit configured to incline a signal waveform of the first control line; and   a second circuit configured to incline a signal waveform of the second control line,   wherein the second circuit inclines a waveform to turn off the light emission control transistor, and the first circuit inclines a waveform to turn off the write transistor,   wherein at a first time, the light emission control transistor is turned on while the write transistor is maintained in an ON state,   wherein at a second time after the first time, the light emission control transistor is turned off while the write transistor is maintained in the ON state, and   wherein at a third time after the second time, the write transistor is turned off while the light emission control transistor is maintained in an OFF state.   
     
     
         2 . The light-emitting device according to  claim 1 , wherein the second circuit inclines a waveform to turn on the light emission control transistor. 
     
     
         3 . The light-emitting device according to  claim 1 , wherein the second circuit makes a slope of the waveform to turn off the light emission control transistor gentler than a slope of a waveform to turn on the light emission control transistor. 
     
     
         4 . The light-emitting device according to  claim 3 , wherein the slope of the waveform leans toward for at most 15% of a period. 
     
     
         5 . The light-emitting device according to  claim 1 , wherein the first circuit inclines a waveform to turn on the write transistor. 
     
     
         6 . The light-emitting device according to  claim 1 , further comprising a scanning circuit configured to supply a signal to each of the first control line and the second control line,
 wherein the scanning circuit is provided with a buffer configured to output the signal.   
     
     
         7 . The light-emitting device according to  claim 6 , further comprising a resistor element located at a subsequent stage of the buffer,
 wherein the resistor element functions as the second circuit.   
     
     
         8 . The light-emitting device according to  claim 6 ,
 wherein the buffer includes a transistor of a first conductivity type and a transistor of a second conductivity type different from the first conductivity type, and   wherein an on-resistance of the transistor of the first conductivity type is different from an on-resistance of the transistor of the second conductivity type.   
     
     
         9 . The light-emitting device according to  claim 8 ,
 wherein the transistor of the first conductivity type is a p-type transistor,   wherein the transistor of the second conductivity type is an n-type transistor, and   wherein the on-resistance of the transistor of the first conductivity type is higher than the on-resistance of the transistor of the second conductivity type.   
     
     
         10 . A photoelectric conversion device comprising:
 an optical unit including a plurality of lenses;   an image sensor configured to receive light having passed through the optical unit; and   a display unit configured to display an image captured by the image sensor,   wherein the display unit includes the light-emitting device according to  claim 1 .   
     
     
         11 . An electronic apparatus comprising:
 a display unit including the light-emitting device according to  claim 1 ;   a casing in which the display unit is provided; and   a communication unit configured to communicate with an external apparatus, the communication unit being provided in the casing.   
     
     
         12 . A lighting device comprising:
 a light source including the light-emitting device according to  claim 1 ; and   one of a light diffusion portion and an optical film configured to pass light emitted from the light source.   
     
     
         13 . A moving body comprising:
 a lighting fixture including the light-emitting device according to  claim 1 ; and   a body provided with the lighting fixture.   
     
     
         14 . A light-emitting device including a plurality of light-emitting elements and a plurality of pixel circuits, the plurality of pixel circuits each including:
 a drive transistor configured to drive a corresponding one of the plurality of light-emitting elements;   a write transistor configured to write a signal to a gate of the drive transistor; and   a light emission control transistor configured to control connection between the gate of the drive transistor and a power supply,   the light-emitting device comprising:   a first control line for controlling the write transistor;   a second control line for controlling the light emission control transistor;   a first circuit configured to incline a signal waveform of the first control line; and   a second circuit configured to incline a signal waveform of the second control line; and   a scanning circuit configured to supply a signal to each of the first control line and the second control line,   wherein the second circuit inclines a waveform to turn off the light emission control transistor, and the first circuit inclines a waveform to turn off the write transistor,   wherein the scanning circuit is provided with a buffer configured to output the signal,   wherein a resistor element is located at a subsequent stage of the buffer, and   wherein the resistor element functions as the second circuit.   
     
     
         15 . The light-emitting device according to  claim 14 , wherein the second circuit inclines a waveform to turn on the light emission control transistor. 
     
     
         16 . The light-emitting device according to  claim 14 , wherein the second circuit makes a slope of the waveform to turn off the light emission control transistor gentler than a slope of a waveform to turn on the light emission control transistor. 
     
     
         17 . A light-emitting device including a plurality of light-emitting elements and a plurality of pixel circuits, the plurality of pixel circuits each including:
 a drive transistor configured to drive a corresponding one of the plurality of light-emitting elements;   a write transistor configured to write a signal to a gate of the drive transistor; and   a light emission control transistor configured to control connection between the gate of the drive transistor and a power supply,   the light-emitting device comprising:   a first control line for controlling the write transistor;   a second control line for controlling the light emission control transistor;   a first circuit configured to incline a signal waveform of the first control line;   a second circuit configured to incline a signal waveform of the second control line; and   a scanning circuit configured to supply a signal to each of the first control line and the second control line,   wherein the second circuit inclines a waveform to turn off the light emission control transistor, and the first circuit inclines a waveform to turn off the write transistor,   wherein the scanning circuit is provided with a buffer configured to output the signal,   wherein a resistor element is located at a subsequent stage of the buffer, and   wherein the resistor element functions as the second circuit.   
     
     
         18 . The light-emitting device according to  claim 17 , wherein the second circuit inclines a waveform to turn on the light emission control transistor. 
     
     
         19 . The light-emitting device according to  claim 17 , wherein the second circuit makes a slope of the waveform to turn off the light emission control transistor gentler than a slope of a waveform to turn on the light emission control transistor.